Miscellaneous In Mining - Study Mode

[#51] A district mine ventilated by 30 m 3 /sec. Quantity of air and the wg in district is 25 mm. Find the resistance of the district.
Correct Answer

(B) $$frac{1}{{36}}{ ext{Ku}}$$

[#52] The CO 2 absorbent used in prototype breathing apparatus.
Correct Answer

(B) Calcium hydroxide and caustic soda

[#53] Which of the following refrigerant is used in u/g air conditioning plant.
Correct Answer

(B) Freon

[#54] In electric discharge lamps, a discharge in mercury vapour produces . . . . . . . . rays.
Correct Answer

(B) Ultra violet

[#55] If the quantity of air required below ground is increased 1.5 times, the HP required to drive the fan varies as . . . . . . . .
Correct Answer

(B) Increases 3.375 times